Toxic effect study of bacillus thuringiensis (b. t. )‎ isolate and Artemisia Judaica l. , plant extract against potato tuber moth, Phthorimaea Operculella (Zeller)‎ (Lepidoptera : Gelechiidae)‎

الملخص EN

Potato tuber moth (PTM), Phthorimaea operculella (Lepidoptera : Gelechiidae) is one of the serious worldwide pest of potato (Solanum tuberosum L.

Solanaceae).

This pest by making irregular tunnels leaves excreta behind and led to a considerable yield loss.

Trials were conducted to evaluate the effect of Bacillus thuringiensis isolate against newly emerged larvae of PTM.

It had been found that the total larval death recorded 14 and 58 % of larval death at 1.25 and 10 CFU/ml, respectively.

The potential of extract of Artemisia Judaica against PTM larvae showed increase in larval mortality from 34 to 76 % at 125 to 1000 ppm, respectively.

In this study, the effect of Artemisia Judaica extract on Phthorimaea operculella larval instar was more effective than the effect of Bacillus thuringiensis isolate.

In order to get the best results when using two bio-control agents in IPM strategies, bacteria should be used first and then the plant extract.